Forward coherent $\varphi$-meson photoproduction from deuterons near threshold

Abstract

Differential cross sections and decay asymmetries for coherent $\varphi$-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at $E_{\gamma }$= 1.5-2.4 GeV. This reaction offers a unique way to directly access natural-parity Pomeron dynamics and gluon exchange at low energies. The cross sections at zero degrees increase with increasing photon energy. The decay asymmetries demonstrate a complete dominance of natural-parity exchange processes, showing that isovector unnatural-parity $\pi$-meson exchange is small. Nevertheless the deduced cross sections of $\varphi$-mesons from nucleons contributed by isoscalar t-channel exchange processes are not well described by the conventional Pomeron model.

14 pages, 6 figures. Final published version

References in corpus (5)

• Diffractive $\varphi$-meson photoproduction on proton near threshold
• Differential cross section and photon beam asymmetry for the gamma n -> K+ Sigma- reaction at Egamma=1.5-2.4 GeV
• Phi-meson photoproduction from nuclei
• Comments on differential cross section of phi-meson photoproduction at threshold
• Photoproduction of phi meson off deuteron near threshold

Cited by in corpus (11)

• Experimental evidence for an attractive p-$\varphi$ interaction
• Evidence of the Θ^+ in the γd \to K^+K^-pn reaction
• Indication of a p-$\varphi$ bound state from a correlation function analysis
• Measurement of Spin-Density Matrix Elements for $\varphi$-Meson Photoproduction from Protons and Deuterons Near Threshold
• $\varphi$ photoproduction on the proton at $E_{\gamma }$ = 1.5 - 2.9 GeV
• Proton and deuteron mass radii from near-threshold $\varphi$-meson photoproduction
• Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV
• $\varphi$ meson properties in nuclear matter from QCD sum rules with chirally separated four-quark condensates
• Testing the $\varphi$-nuclear potential in pion-induced $\varphi$ meson production on nuclei near threshold
• Extraction of $\omega$n, $\omega$p and $\varphi$N scattering lengths from $\omega$ and $\varphi$ differential photoproduction cross sections on the deuterium target
• Analysis of the interaction between $\varphi$ meson and nucleus